edo tensei

In Naruto, Kuchiyose: Edo Tensei or Summoning: Impure World Reincarnation is a jutsu that can summon the dead as immortal zombie-like creatures to fight for the summoner. The reincarnated regenerate if damaged and possess infinite chakra, making them difficult to defeat. Someone who has been reincarnated with this technique has black sclera and cracked skin.